Class notes 9/12
September 12, 2007Today we discussed (among other things) the first two postulates, found in Lesson 1.2: The Ruler Postulate and the Segment Addition Postulate. Remember that a postulate is a rule that we accept without proof, while a theorem is rule which we are able to prove.
The Ruler Postulate basically says that we can put a name or value to every point on a number line, and that between any two points that you can name, I can name another.
The Segment Addition Postulate says that you can add two segments on the same line together to get another segment, and that the length of the combined segment is equal to the sum of the lengths of the two smaller segments.
We’ll use the ideas of the Segment Addition Postulate tomorrow when we discuss MIDPOINT and DISTANCE on a line segment.
Double extra credit for the first three students who make a comment to this post who haven’t made a comment to today’s Assignments post.
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